/**
* jQuery Lightbox
* @author Warren Krewenki
*
* This package is distributed under the BSD license.
* For full license information, see LICENSE.TXT
*
* Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
*
*
**/

var link_template_url = $('#link_template_url').val();
//alert(link_template_url);

(function($) {
$.fn.lightbox = function(options) {
// build main options
var opts = $.extend({}, $.fn.lightbox.defaults, options);
        
$(window).resize(resizeOverlayToFitWindow);
        
return $(this).live(opts.triggerEvent,function(){
// initialize the lightbox
initialize();
showLightbox(this);
return false;
});
/*
# Initialize the lightbox by creating our html and reading some image data
# This method is called by the constructor after any click events trigger it
# You will never call it by itself, to my knowledge.
*/
function initialize() {
$('#overlay, #lightbox').remove();
opts.inprogress = false;

// if jsonData, build the imageArray from data provided in JSON format
if (opts.jsonData && opts.jsonData.length > 0) {
var parser = opts.jsonDataParser ? opts.jsonDataParser : $.fn.lightbox.parseJsonData;
opts.imageArray = [];
opts.imageArray = parser(opts.jsonData);
}
    
var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><iframe id="lightboxIframe"></iframe><img id="lightboxImage" /><div id="hoverNav"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="prevLink"></a><a href="javascript://" id="nextLink" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
var imageData = '<div id="imageDataContainer" class="clearfix"><div id="imageData"><div id="imageDetails"><span id="numberDisplay"></span></div><div id="bottomNav">';

if (opts.displayHelp) {
imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
}

imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div></div></div>';

var string;

if (opts.navbarOnTop) {
string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
$("body").append(string);
$("#imageDataContainer").addClass('ontop');
} else {
string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
$("body").append(string);
}

$("#overlay, #lightbox").click(function(){ end(); }).hide();
$("#loadingLink, #bottomNavClose").click(function(){ end(); return false;});
$('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
$('#imageDataContainer').width(opts.widthCurrent);

if (!opts.imageClickClose) {
$("#lightboxImage").click(function(){ return false; });
$("#hoverNav").click(function(){ return false; });
}

return true;
};

/*
# Get the document and window width/heigh
#
# Examples
#
# getPageSize()
# # => [1024,768,1024,768]
#
# Returns a numerically indexed array of document width/height and window width/height
*/
function getPageSize() {
var jqueryPageSize = new Array($(document).width(),$(document).height(), $(window).width(), $(window).height());
return jqueryPageSize;
};

function getPageScroll() {
var xScroll, yScroll;

if (self.pageYOffset) {
yScroll = self.pageYOffset;
xScroll = self.pageXOffset;
} else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
yScroll = document.documentElement.scrollTop;
xScroll = document.documentElement.scrollLeft;
} else if (document.body) {// all other Explorers
yScroll = document.body.scrollTop;
xScroll = document.body.scrollLeft;
}

var arrayPageScroll = new Array(xScroll,yScroll);
return arrayPageScroll;
};

/*
# Deploy the sexy overlay and display the lightbox
#
# imageObject - the jQuery object passed via the click event in the constructor
#
# Examples
#
# showLightbox($('#CheesusCrust'))
#
# Returns a boolean true, because it's got nothing else to return. It should give visual feedback when run
*/
function showLightbox(imageObject) {
/**
* select, embed and object tags render over the lightbox in some browsers
* Right now, the best way to fix it is to hide them, but that can trigger reloading of some flash content
* I don't have a better fix for this right now, but I want ot leave this comment here so you and I both
* know that i'm aware of it, and I would love to fix it, if you have any suggestions.
**/
$("select, embed, object").hide();

// Resize and display the sexy, sexy overlay.
resizeOverlayToFitWindow();
$("#overlay").hide().css({ opacity : opts.overlayOpacity }).fadeIn();
imageNum = 0;

// if data is not provided by jsonData parameter
if (!opts.jsonData) {
opts.imageArray = [];
// if image is NOT part of a set..
if ((!imageObject.rel || (imageObject.rel == '')) && !opts.allSet) {
// add single image to Lightbox.imageArray
opts.imageArray.push(new Array(imageObject.href, opts.displayTitle ? imageObject.title : ''));
} else {
// if image is part of a set..
$("a").each(function() {
if(this.href && (this.rel == imageObject.rel)) {
opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
}
});
}
}

//alert(opts.imageArray);

if (opts.imageArray.length > 1) {
for (i = 0; i < opts.imageArray.length; i++) {
for (j = opts.imageArray.length - 1; j > i; j--) {
if (opts.imageArray[i][0] == opts.imageArray[j][0]) {
opts.imageArray.splice(j, 1);
}
}
}

while (opts.imageArray[imageNum][0] != imageObject.href) {
imageNum++;
}
}

// calculate top and left offset for the lightbox
var arrayPageScroll = getPageScroll();
var lightboxTop = arrayPageScroll[1] + ($(window).height() / 10);
var lightboxLeft = arrayPageScroll[0];
$('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();

if (!opts.slideNavBar) {
$('#imageData').hide();
}

changeImage(imageNum);
};

function changeImage(imageNum) {
if (opts.inprogress == false) {
opts.inprogress = true;

// update global var
opts.activeImage = imageNum;

// hide elements during transition
$('#loading').show();
$('#lightboxImage, #hoverNav, #prevLink, #nextLink').hide();

// delay preloading image until navbar will slide up
if (opts.slideNavBar) {
$('#imageDataContainer').hide();
$('#imageData').hide();
}
doChangeImage();
}
};

function doChangeImage() {
imgPreloader = new Image();

// once image is preloaded, resize image container
imgPreloader.onload = function() {
var newWidth = imgPreloader.width;
var newHeight = imgPreloader.height;

if (opts.scaleImages) {
newWidth = parseInt(opts.xScale * newWidth);
newHeight = parseInt(opts.yScale * newHeight);
}

if (opts.fitToScreen) {
var arrayPageSize = getPageSize();
var ratio;
var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
var initialPageHeight = arrayPageSize[3] - 200;

var dI = initialPageWidth/initialPageHeight;
var dP = imgPreloader.width/imgPreloader.height;

if ((imgPreloader.height > initialPageHeight) || (imgPreloader.width > initialPageWidth)) {
if (dI > dP) {
newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
newHeight = initialPageHeight;
} else {
newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
newWidth = initialPageWidth;
}
}
}

$('#lightboxImage').
attr('src', opts.imageArray[opts.activeImage][0]).
width(newWidth).
height(newHeight);

resizeImageContainer(newWidth, newHeight);
};

imgPreloader.src = opts.imageArray[opts.activeImage][0];
};

function end() {
disableKeyboardNav();
$('#lightbox').hide();
$('#overlay').fadeOut();
$('select, object, embed').show();
};

function preloadNeighborImages() {
if (opts.loopImages && opts.imageArray.length > 1) {
preloadNextImage = new Image();
preloadNextImage.src = opts.imageArray[(opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1][0];

preloadPrevImage = new Image();
preloadPrevImage.src = opts.imageArray[(opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1][0];
} else {
if ((opts.imageArray.length - 1) > opts.activeImage) {
preloadNextImage = new Image();
preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
}
if (opts.activeImage > 0) {
preloadPrevImage = new Image();
preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
}
}
};

function resizeImageContainer(imgWidth, imgHeight) {
// get current width and height
opts.widthCurrent = $("#outerImageContainer").outerWidth();
opts.heightCurrent = $("#outerImageContainer").outerHeight();

// get new width and height
var widthNew = Math.max(350, imgWidth + (opts.borderSize * 2));
var heightNew = (imgHeight + (opts.borderSize * 2));

// calculate size difference between new and old image, and resize if necessary
wDiff = opts.widthCurrent - widthNew;
hDiff = opts.heightCurrent - heightNew;

$('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
$('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear', function() {
$('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear', function() {
showImage();
});
});

afterTimeout = function () {
     $('#prevLink').height(imgHeight);
     $('#nextLink').height(imgHeight);
};

// if new and old image are same size and no scaling transition is necessary,
// do a quick pause to prevent image flicker.
if((hDiff == 0) && (wDiff == 0)) {
if (jQuery.browser.msie) {
setTimeout(afterTimeout, 250);
} else {
setTimeout(afterTimeout, 100);
}
} else {
// otherwise just trigger the height and width change
afterTimeout();
}

};

function showImage() {
$('#loading').hide();
$('#lightboxImage').fadeIn("fast");
updateDetails();
preloadNeighborImages();

opts.inprogress = false;
};

function updateDetails() {
$('#numberDisplay').html('');

if (opts.imageArray[opts.activeImage][1]) {
$('#caption').html(opts.imageArray[opts.activeImage][1]).show();
}

// if image is part of set display 'Image x of x'
if (opts.imageArray.length > 1) {
var nav_html;
var title;

//title = $(this).arrt("title");
//alert(opts.strings.image.arrt("title"));
//alert(opts.imageArray[opts.activeImage][1]);  title
nav_html = (opts.activeImage + 1) + '/' + opts.imageArray.length + '&nbsp; <i>' + opts.imageArray[opts.activeImage][1] + '</i>';

if (opts.displayDownloadLink) {
nav_html += "<a href='" + opts.imageArray[opts.activeImage][0] + "'>" + opts.strings.download + "</a>";
}

if (!opts.disableNavbarLinks) {
// display previous / next text links
if ((opts.activeImage) > 0 || opts.loopImages) {

}

if (((opts.activeImage + 1) < opts.imageArray.length) || opts.loopImages) {


}
}

$('#numberDisplay').html(nav_html).show();
}

if (opts.slideNavBar) {
$("#imageData").slideDown(opts.navBarSlideSpeed);
} else {
$("#imageData").show();
}

resizeOverlayToFitWindow();
updateNav();
};

/*
# Resize the sexy overlay to fit the constraints of your current viewing environment
#
# This should now happen whenever a window is resized, so you should always see a full overlay
*/
function resizeOverlayToFitWindow(){
$('#overlay').css({width: $(document).width(), height: $(document).height()});
// ^^^^^^^ <- sexy!
};

function updateNav() {
if (opts.imageArray.length > 1) {
$('#hoverNav').show();

// if loopImages is true, always show next and prev image buttons
if(opts.loopImages) {
$('#prevLink,#prevLinkText').show().click(function() {
changeImage((opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1);
return false;
});

$('#nextLink,#nextLinkText').show().click(function() {
changeImage((opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1);
return false;
});

} else {
// if not first image in set, display prev image button
if(opts.activeImage != 0) {
$('#prevLink,#prevLinkText').show().click(function() {
changeImage(opts.activeImage - 1);
return false;
});
}

// if not last image in set, display next image button
if(opts.activeImage != (opts.imageArray.length - 1)) {
$('#nextLink,#nextLinkText').show().click(function() {
changeImage(opts.activeImage +1);
return false;
});
}
}

enableKeyboardNav();
}
};

function keyboardAction(e) {
var o = e.data.opts;
var keycode = e.keyCode;
var escapeKey = 27;

var key = String.fromCharCode(keycode).toLowerCase();

// close lightbox
if ((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)) {
end();

// display previous image
} else if ((key == 'p') || (keycode == 37)) {
if(o.loopImages) {
disableKeyboardNav();
changeImage((o.activeImage == 0) ? (o.imageArray.length - 1) : o.activeImage - 1);
} else if (o.activeImage != 0) {
disableKeyboardNav();
changeImage(o.activeImage - 1);
}

// display next image
} else if ((key == 'n') || (keycode == 39)) {
if (opts.loopImages) {
disableKeyboardNav();
changeImage((o.activeImage == (o.imageArray.length - 1)) ? 0 : o.activeImage + 1);
} else if (o.activeImage != (o.imageArray.length - 1)) {
disableKeyboardNav();
changeImage(o.activeImage + 1);
}
}
};

function enableKeyboardNav() {
$(document).bind('keydown', {opts: opts}, keyboardAction);
};

function disableKeyboardNav() {
$(document).unbind('keydown');
};
};

$.fn.lightbox.parseJsonData = function(data) {
var imageArray = [];

$.each(data, function() {
imageArray.push(new Array(this.url, this.title));
});

return imageArray;
};

$.fn.lightbox.defaults = {
triggerEvent: "click",
allSet: false,
fileLoadingImage: link_template_url + '/images/loading.gif',
fileBottomNavCloseImage: link_template_url + '/images/closelabel.gif',
overlayOpacity: 0.6,
borderSize: 10,
imageArray: new Array,
activeImage: null,
inprogress: false,
resizeSpeed: 350,
widthCurrent: 250,
heightCurrent: 250,
scaleImages: false,
xScale: 1,
yScale: 1,
displayTitle: true,
navbarOnTop: false,
displayDownloadLink: false,
slideNavBar: false,
navBarSlideSpeed: 350,
displayHelp: false,
strings: {
help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
prevLinkTitle: 'previous image',
nextLinkTitle: 'next image',
prevLinkText: '&laquo; Previous',
nextLinkText: 'Next &raquo;',
closeTitle: 'close image gallery',
image: 'Image ',
of: ' of ',
download: ''
},
fitToScreen: false,
disableNavbarLinks: false,
loopImages: false,
imageClickClose: true,
jsonData: null,
jsonDataParser: null
};
})(jQuery);